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Revenue (Tables)
 6 Months Ended
Jun. 30, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Passenger Revenue The following table provides the components of Passenger revenue recognized for the three and six months ended June 30, 2025 and 2024:
 Three months ended June 30,Six months ended June 30,
(in millions)2025202420252024
Passenger non-loyalty$5,448 $5,544 $10,214 $10,224 
Passenger loyalty - air transportation870 895 1,670 1,694 
Passenger ancillary sold separately309 273 554 506 
Total passenger revenues$6,627 $6,712 $12,438 $12,424 
Schedule of Rollforward of Air Traffic Liability
As of June 30, 2025, and December 31, 2024, the components of Air traffic liability, including contract liabilities based on tickets sold and unused flight credits available to the Customer, both of which are net of recorded breakage, and loyalty points available for redemption, within the unaudited Condensed Consolidated Balance Sheet were as follows:
 Balance as of
(in millions)June 30, 2025December 31, 2024
Air traffic liability - passenger travel and ancillary passenger services$3,603 $3,393 
Air traffic liability - loyalty program4,693 4,849 
Total Air traffic liability$8,296 $8,242 
Rollforwards of the Company's Air traffic liability - loyalty program for the three and six months ended June 30, 2025 and 2024 were as follows:
Three months ended June 30,Six months ended June 30,
(in millions)2025202420252024
Air traffic liability - loyalty program - beginning balance$4,841 $4,987 4,849 $4,916 
Amounts deferred associated with points awarded748 901 1,565 1,794 
Revenue recognized from points redeemed - Passenger(870)(895)(1,670)(1,694)
Revenue recognized from points redeemed - Other(26)(31)(51)(54)
Air traffic liability - loyalty program - ending balance$4,693 $4,962 $4,693 $4,962 
Rollforwards of the amounts included in Air traffic liability as of June 30, 2025 and 2024 were as follows:
Six months ended June 30,
(in millions)20252024
Air traffic liability - beginning balance$8,242 $8,279 
Current period sales (a)12,489 13,276 
Revenue from amounts included in contract liability opening balances(3,855)(4,021)
Revenue from current period sales(8,580)(8,458)
Air traffic liability - ending balance$8,296 $9,076 
(a)Current period sales include passenger travel, ancillary services, flight loyalty, and partner loyalty